Yeah, It definitely helps to have the right tools.
I bet the pros also use the pre-fab headers that you are using. Time is money for those guys. I am sure any that are worth their salt could do the job without it and, depending on their supplier, probably do, but they don't want to spend any more time than they have to. Also, most of them are employing the $10/hr hands too. They don't want to be in a position where they have to do all the hard stuff!
I usually opt for having the pros hang the wall board too. It is hard to get it just right. Besides, I have enough shoulder/back/neck problems without doing that kind of work!
Anyway, it looks like you are doing an excellent job.